[ANGLÈS] The objective of this work is to analyze and test the wireless integrity of a typical car's network. The motivation for this work comes from the hazard that is to have security intrusions for a tool that a huge per cent of people use and that, upon failing, can produce such great damage. First, the basis of a car's network will be studied and a plan of attack will be put together. Then, a working analogue of a common car will be used to put that plan to test and draw conclusions. This work might become the First step of a larger project to improve and upgrade car network security but at least for now should be able to put in evidence the danger that all car users could be subject when driving.